I tend to ride in the drops quite a bit, I find it very comfortable. I also ride in the drops for just about what everyone else named here plus taking off from a stop. I find the drops much easier to ride in when doing an explosive standing take off. and here here on the headwinds, I'll go as low into the drops as I can when I've got headwinds - helps with the buffeting.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"